Plaubelia Bridel, 1826.

Plaubelia sprengelii is not yet recorded for California, but it is not uncommon in northern Baja California. It is easily placed in the Pottiaceae on the basis of being acrocarpous with isodiametric cells and with some enlargement of the basal cells. It has plane to incurved margins, and would seem close to Timmiella on the basis of the mammillose adaxial surface of the cells. However, Timmiella is bistratose while Plaubelia is unistratose.
see key to Weissia Etc.